Can a couple sit alone or are all tables with other people?

A couple can sit alone and actually most of their seating provides a good amount of privacy

You might have a table to your self but beware if they sit you near a large table. When we were there, we wound up with two groups next to us. One was a table of young screaming girls for a birthday party and the was a table full of teenagers. They made so much noise that the server could not hear us when taking our orders. The manager asked them to quiet down which lasted about 5 minutes. The only good thing about our experience was the food was good.

Yes, there ate private booths.

You can sit alone. They even have areas just for two with a curtain to give you privacy

I'd say half their clientele are couples.

Yes

So when you make a reservation what do you need to do to get a private table?